Digital signal transmission system using frequency division multiplex
作者： Mark Charles Dobell Maddocks , Peter Shelswell
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摘要: A frequency-division-multiplex transmitter for carrying an OFDM signal on a large number of closely-spaced carriers receives the digital data at input (12), applies coding such as convolutional (14), time interleaves (16) signals, and assembles them frame-by-frame in matrix (18). The is converted to parallel form by shift register (18), frequency interleaved, (24) differentially encoded (26), quadrature phase modulated (28) several hundred or more carriers. first inverse Fast Fourier Transform circuit (30) transforms this information domain into domain. Instead being transmitted directly, resultant signals are then amplitude limited (42) applied FFT (44) reconvert phases wanted re-set, amplitudes near edges band reduced, correction circuits (46). second (48) transmission. output contains smaller power peaks than (30). serial (32), guard interval added (34), (36) analogue form.
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